_Comatose Flow._--It must have been observed by many persons while dozing and the body in a sitting or leaning posture, that an agreeable warm glow arises in the chest, which increases while passing sensibly through the pectoral towards the gastric region, and which terminates, insensibly, in the consummation of sleep; from the feet upwards a similar, but less perceptible, flow takes place. Of this twofold _comatose flow_, the immediate consequence is polarisation of the extremities; sleep is a remote, but not the remotest consequence, when effects similar to those by the flow are mesmerically effected. Thus it appears that the theory of sleep and magnetism is the same. The magnetising procedure, however, has this difference; the magnetic correlatives are drawn from the middle to and out of the extremities of the bar; those of the body of the patient recede from the extremities to the central region, leaving one, the correlative of the other, at each extremity, in both cases. The foregoing theory of sleep is described from immediate personal observation. While leaning over a table, the doze heavy, the comatose flow distinctly felt in its agreeable downward progress through the chest, when, just at the instant of forgetfulness, the violent slam of a door drove away all chance of sleep under the following circumstances: a sensible and sudden revulsion upwards, a few seconds of giddiness, and a smart painful stroke on the stomach took place, all in quick succession; which may be accounted for thus: the slam prevented the correlative fluids from the opposite extremities meeting centrally; each gushed irregularly back, and depolarized its extremity, the suddenness of which caused the giddiness. The stroke is the true electric shock, inflicted by the medium of space suddenly rushing or falling on the stomach, from which the matter of the comatose flow had been as suddenly displaced. Taking all circumstances into consideration, it is manifest that the state of sleep is the result of a natural magnetizing operation. Before the fire, while reading, the superior extremity loses electric matter to the fire, which leaves it polarized and promotes the comatose flow. The lower extremity becomes polarized simultaneously with the upper as a correlative consequence. Sleep is supposed to be expedited by heat; hence the afternoon's nap is seconded by a silk handkerchief thrown over the head, but which is only a hindrance to electric matter, similar to that of the comatose flow entering from the air and depolarizing the extremity. The handkerchief, from being a non-conductor, only prevents the coming sleep being retarded; it could neither generate nor multiply heat.